CVE-2022-2166: Joinmastodon Mastodon

Critical severity, CVSS 9.8. EPSS: 1.1% chance of exploitation in the next 30 days.

Improper Restriction of Excessive Authentication Attempts in GitHub repository mastodon/mastodon prior to 4.0.0.

Affected products

• Joinmastodon Mastodon: up to and including 3.5.5; version 4.0.0 only

Published 2022-11-16. Last modified 2026-06-17.